This is sooo Beautiful and Timeless. One has a small chip with a loop. I cannot find any maker or purity marks. I have not tried to clean this, I think behind a few diamonds could use a cleaning.Great dimention from side, little under 1/2. Measures 2.5" by 1.25". Check my store for similar Pieces just in. It looks to be european to me based on multiple factors. The item "Vintage Art Deco Genuine 5 Paste DIAMOND Sterling Silver Brooch Pin Large" is in sale since Monday, July 30, 2018. This item is in the category "Jewelry & Watches\Vintage & Antique Jewelry\Fine\Art Nouveau/Art Deco 1895-1935\Pins, Brooches". The seller is "shopvintagejewelryaddiction" and is located in East Providence, Rhode Island. This item can be shipped worldwide.